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The stage of human development that occurs from implantation to about eight weeks after fertilization is the


A) zygote.
B) preembryonic stage.
C) gastrula.
D) fetal stage.
E) embryonic stagE.

F) B) and D)
G) A) and D)

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A female salmon laying unfertilized eggs in a nest is preparing them for ____ by a male salmon.


A) external fertilization
B) internal fertilization
C) indirect development
D) direct development
E) differentiation

F) B) and C)
G) A) and C)

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In a secondary oocyte,meiosis is arrested in metaphase II until


A) ovulation.
B) FSH is present.
C) fertilization occurs.
D) LH is secreted by the anterior pituitary.
E) puberty.

F) B) and C)
G) All of the above

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What is the ideal outcome of the human reproductive system?


A) to create individuals better suited to the environment than the existing individuals
B) to create diploid gametes
C) to break down foreign invaders and pathogens in any location in the body
D) to remove foreign invaders and pathogens entering through the genitals
E) All answers are correct.

F) None of the above
G) A) and D)

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Genital warts are caused by HPV.

A) True
B) False

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Which is correct about sexually transmitted diseases?


A) All STDs are treatable with antibiotics if caught early enough.
B) STDs cannot be contracted through oral sex.
C) All answers are correct.
D) Viruses,bacteria,protists,and fungi can cause STDs.
E) All STDs can kill a human if left untreated.

F) All of the above
G) B) and C)

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If you wanted to sample most of the fluid found in the semen before sperm are added,you would need to cut into the


A) epididymis.
B) urethra.
C) ejaculatory duct.
D) seminal vesicle.
E) seminiferous tubulE.

F) A) and D)
G) C) and D)

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In humans,the transparent sac that contains fluid that cushions the embryo and maintains a constant temperature and pressure is the


A) amnion.
B) yolk sac.
C) embryonic disC.
D) chorionic villus.
E) chorion.

F) A) and B)
G) A) and C)

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The events of the birthing process use positive feedback.The stretching of the cervix during prelabor or stage 1 of labor causes the hypothalamus to trigger the pituitary gland to release the hormone oxytocin,which causes uterine contractions.

A) True
B) False

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The ovarian cycle prepares the uterus for pregnancy.

A) True
B) False

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